METHOD TO APPLY NANOCOMPOSITE COATING ONTO SURFACE OF ITEM FROM HEAT-RESISTANT NICKEL ALLOY Russian patent published in 2015 - IPC C23C14/35 C23C8/36 B82Y30/00 

FIELD: technological processes.

SUBSTANCE: invention relates to the field of machine building, in particular, to the method to produce a protective nanocomposite coating on the surface of the item from heat-resistant nickel alloy exposed to high temperatures and mechanical loads. The item and the vacuum chamber are cleaned in the medium of inert gas, ion etching is carried out, after which they perform ion-plasma cementation, additionally they perform ion etching of the item surface and apply the coating by the method of physical deposition from vapour phase. Ion-plasma cementation with subsequent ion etching is carried out in stages with number of stages N, besides N≥1, until saturation of the near-surface layer with carbon in the specified item for the depth of up to 50 mcm. Onto the surface of the item they apply at least one microlayer from nichrome and aluminium alloy with silicon, which consists of nanolayers of specified materials with thickness of 1-100 nm, and then they apply a microlayer from nanolayers of oxides of nichrome and aluminium alloy with silicon having thickness of 1-100 nm. In particular cases of invention realisation the total thickness of a microlayer from nichrome and aluminium alloy with silicon makes 2.3-3.0 mcm, at the same time the specified microlayer is applied by means of serial passage of the item in front of targets of magnetrons from the specified materials. The thickness of a microlayer from oxides of nichrome and aluminium alloy with silicon makes 0.5-1.5 mcm, at the same time the specified microlayer is applied by means of serial passage of the item in front of targets of magnetrons from the specified materials as oxygen is supplied into the chamber.

EFFECT: invention provides for increased durability and heat resistance of a nickel alloy under conditions of high-temperature oxidation and erosion impact.

3 cl, 1 tbl, 1 ex